Phonograph



y 1 1 J, BISHOP ET AL PHONOGRAPH Filed Sept. 22. 1921 5 Sheets-Sheet 1 J. W. BISHOP ET AL PHONOGRAPH Filed Sept. 22 1921 3 Sheets-Sheet 2 J. W. BISHOP ET AL PHONOGRAPH Filed Sept. 22. 1921 5 Sheets5heet 5 Patented July 13, 1926.

UNITED STATES PATENT OFFICE.

JOSEPH W. BISHOP AND JESSE O. MATTESON, OF MUSKEGON, MICHIGAN, ASSIGNORS 110 THE IBRUNSWICK-IBALKE-COLLENDER COMPANY, OF CHICAGO, ILLINOIS, A

CORPORATION OF DELAWARE.

PHONOGRAPH.

Application filed September 22, 1921. Serial No. 502,434.

This invention relates to phonographs and has special reference to mechanism for causing the needle or stylus to move in a straight line across the record and for maintaining the diaphragm of the reproducer substantially tangent to the record groove.

The object is to produce mechanism for effecting these desirable results which will be easy to manufacture and will be durable and eflicient in service.

One embodiment of the invention is shown in the accompanying drawings in which Fig. 1 is a plan view of the operating parts above the motor board;

Fig. 2 is a side elevation of the improved structure showing portions of the motor board and the record table;

Fig. 3 is a vertical section on the line 33 of Fig. 1.

Fig. 4 is a vertical section on the line 44 of Fig. 2.

Fig. 5 is a transverse section on the line 5--5 of Fig. 2.

Fig. 6 is a transverse section on the broken line 66 of Fig. 2.

Fig. 7 is a vertical section on the broken line 7--'7 of Fig. 1. v

Fig. 8 is a transverse vertical section of the tone arm on the line 8-8 of Fig. 1.

Referring to the drawings, 1 indicates a motor board and 2 the record table on which the record 3 is mounted in position to act upon the stylus 4 carried by the reproduce!- 5 supported on the tube 6 pivoted at '7 to the tone arm extension 8 which in turn is connected to the tone arm 9 by the sleeve 10 threaded into the tone arm and the extension. At its larger end the tone arm is equipped with the tube 11 extending downwardly through the motor board and making a sound transmission connection with the born 12. on the bearings 13 in a shiftable support 14 carried by the links 15 having their upper ends pivoted thereto and their lower ends pivoted at 17 to the legs 18 of a hanger 19 secured to the motor board by the screws 20 or other suitable devices and having therein an opening 21 of the shape indicated in Fig. 5. Below the lower bearing 13 the sleeve 11,-is equipped with an arm 22 secured thereto'by the split collar 23, closed upon the tube by the bolt 24. This lever extends diagonally downward and is equipped at The tone arm is journalled the corresponding faces 31 of the opening 21 within the hanger 19. It also has a flange 32of suflicient extent to cover the opening 21 in all positions in which the bearing 14 may be placed.

The tone arm extension 8 has adjacent to its connection with the tone arm a lever 33, the free end of which is connected by a link 34 to a corresponding lever carried by the bearing 14. The length of the levers 33 and 3.5 is such that the link 34 is parallel to the axis of the tone arm, thus maintaining the diaphragm in successive parallel positions and substantially tangent to the record groove. To facilitate assembly and provide means for taking up play, the link 34 is connected to the lever 35 through the medium of the post 36 having a cylinder head 37 swivelled to the nut 38 threaded on the link 34.

It will be obvious that in swinging the tone arm about the axis of the tube 11 the wheel 26 running on the rail 27 will cause the bearing 14 to swing on the links 15 and move towards or away from the vertical plane passing through the rail 27 a distance governed by the action of the lever 22 as it moves along the rail; and that this movement on the part of the bearing 14 will have the effect of limiting the needle or stylus to travel in a line parallel to the track 27. It will thus be seen that the mechanism described will result in the needle travelling in a right line from the outside of the record to the inner end of the record groove, and that the diaphragm of the reproducer 5 will be at all times substantially tangent to the record groove.

In order to compensate for the movement of the tube 11 we have made the opening in the upper end of the horn 12 of suitable size and shape so that the lower end of the curved as indicated at 40, so that when the needle is moved beyond the record it can swing on a suitable are for any farther movement found desirable.

We are aware that changes in the form and proportion of parts, and in the details of construction of our invention may be made without departing from the spirit or sacrificing any of the advantages thereof, and we reserve the right to make all such changes as fairly fall within the scope of the following claims.

\Ve claim:

1. In a phonograph employing a grooved record, a stylus to cooperate with said groove, means causing said stylus to traverse said record in a right line, and means maintaining said stylus in a plane substantially tangent to said groove.

2. In a phonograph, a record, a reproducer having a stylus adapted to co-operate with said record, a tone arm connected to the reproducer and mounted-in a movable bearing, means to move said healing so as to cause said stylus to traverse the record in a right line, and means to cause said reproiducer to move through successive parallel positions.

3. In a phonograph, a record, a reproducer having a stylus adapted to co-operate with the record, a tone arm pivoted to the reproducer and pivotally mounted in a shiftable bearing, means to cause said shittable bearing to travel so that the stylus will traverse the record on a right line, an arm carried by the said reproducer, an arm of equal length on the said bearing, and a link connecting said arms parallel to the axis to the tone arm.

4. In a phonograph, a record, a reproducer equipped with a stylus and a diaphragm, a tone arm connected with the reproducer, a shiftable bearing for said tone arm, means for pivotally supporting said 5 shiftable bearing, a guide, and means controlled by the said guide and connected with said shiftable bearing for limiting the travel of the stylus to a straight line.

5. In a phonograph, a record, a reproducer, a shiftable bearing for said reproducer, means for pivotally supporting said shiftable bearing, a guide, and an arm connected with said bearing and having means engaged with said guide.

6. In a phonograph, a record, a stylus, a reproducer, means for supporting the reproducer, including a shiftable bearing, links supporting the shiftable bearing, an arm connected with said shiftable bearing, and a guide for said arm whereby said stylus is constrained to movement in a straight line.

7. In a phonograph, a record, a reproducer having a stylus and a diaphragm, a tone arm pivoted to the reproducer and rotatably mounted upon a support, means connected with said support for limiting said stylus to travel in a straight line, and means connected with said support and said tone arm for maintaining said stylus in a plane substantially tangent to the record groove while it travels a straight line.

8. In a phonograph, a record having a groove therein, a stylus adapted to cooperate with the groove, and means for causing the stylus to move in a straight line across the record comprising a shiftable bearing, a link for supporting the shiftable bearing, and a guide operatively engaged by the shiftable bearing.

9. In a phonograph, a record having a groove therein, a reproducer having a stylus adapted to cooperate with the record, a tone arm pivoted to the reproducer, supporting means for pivotally mounting the tone arm, an arm carried by the reproducer, a link connecting the arm with the supporting means, and means for causing the stylus to traverse the record in a right line.

10. In a phonograph, a record having agroove therein, a reproducer having a stylus adapted to cooperate with the record, a tone arm pivoted to the reproducer, supporting means for pivotally mounting the tone arm, an arm carried by the reproducer, a link connecting the arm with the supporting means, and a guide co-operating with the tone arm for causing the stylus to traverse the record in a right line.

11. In a phonograph, a record having a groove therein, a reproducer having a stylus adapted to cooperate with the record, a tone arm pivoted to the reproducer, a shiftable bearing for pivotally mounting the tone arm, an arm carried by the reproducer, a link connecting the arm with the shiftable bearing, and means operatively engaged by the shiftable bearing for causing the stylus to move in a right line.

JESSE O. MATTESON. JOSEPH W. BISHOP. 

